Valve grinding tool



'Pfamh E9, 1935, 1 o. BEARD VALVE GRINDING VTOOL Filed May l1, 1934 Patented Mar. 19, 1935 UNITED"STATES,4 PATE? orties Y 1,994,620v` VALVE GRINDIYNG Toon Lawrence O. Beard,`Lancaster, Pa." Application .Mayv 11, 1934,"seria1 No. 725,170 v claims;v (o1. SLL-1an My invention relates toa tool for grinding valve 4, tightly clampsthe vwasher against the at surseatsand more particularly the conical seats face 10, of the grinding head.V i formed in the motor blocks of internal combus- A thin circular disk of emery cloth or paper tion engines. i 14, having an aperture 15 constitutes the abasive 5 The principal object of the invention is to prolelement fongrndng the Valve Seat, 110i? ShOWlL 5 vide a tool having a flexible paper or cloth abra- The abrasive disk 14 is vsleeved over the conical sive element which is mounted for ready removal Werking SUlfaCe 9 0f the grinding head and and which may be easily renewed when worn; caused to `conform closely to the` contour ofv the Another object of the invention is to provide latter by means 0f a'substaltially lgd 01 Semi- 10 a tool adaptable for use with soft aswell as hard rigid Clamping member OI' Spider 16 formed 0f l0 surfaces. i x slightly yielding metal. Clamping memberl 16 Another object is to provide a tool that can be COmDlSeS a IlarlOW annular 01' ring like Dertien handled witheither a bit brace, a breast drill, or 17 the lOOTe and diameter O Which are I'eSlleCl'IVelY quarter inch electric drill. f just sunicient to permit of the clamping member l5 Theseand other objects will be apparent'rfrom being sleeved over the reduced portion of the l5' the following description in `which the same nushank and in abutting'relai/OH Wth'WaSheI 12- merals designate similar parts in theseveral views. Projecting ulJWal'dlY and O-ll'WElldlY from the'arl* In the drawing: Y 'nulus 1'7 of clamping member 16, are a plurality Figure 1 is a side. elevation of the assembled of armsY 18, one for each grooveV 11, in which 20 tool in operative position, thepil'ot stem not be` grooves these arms are adaped to snugly nt when 20 ing shown; Y thelatter, together with the adjacent portions Figure 2 is a vside elevation ofthe shank and ofthe abrasive disk, are pressed thereinto. The pilot stem; Y i l arms are V shaped and tapered to snugly nti into Figure 3 is a side eleva-tion'of the grinding and conform with` the groovesil, and serve to head; Y l clamp or press theabrasive cloth against the 25 Figure 41s a plan view of the grinding head; sides of the grooves, the upper inner end edges Figure 5 is an elevation of the clamping memof the arms being slightly rounded or concave as ber for securing the abrasive member to the at 18a to eliminate sharp cutting edges and allow Y grinding head; some slight stretching movement of the cloth Figure 6 is a plan view of the clamping memthus preventing the cloth from cracking or tear- 30 ber; ing when forced home in the grooves 11. The Figure '7 is a plan view of the clamp nut; Clamp bottom or annulus 17 is slightly concave Figure 8 is a plan view of the abrasive disk; and as at 17a tol press the abrasive cloth against the Figure 9 is a plan view of the washer. base of the grinding head and allow some slight Referring morespecically to the drawing, the stretching of the cloth at this point. Those por- 35 numeral 1 designates the tool generally compristions of the disk 14 which are pressed by arms ing a shank 2 of standard size having a portion 18 into the grooves 11, have their outer peripheral 3 of suitable length reduced in diameter and edges squared off, as at 19, so that the margins threaded at its lower end, as atY 4, and having of the disk within the groove will not extend over 40 its lower end bored to receive a pilot stem 5, and 6 the margin of the groove and thus become frayed 40 is a conically shaped grinding head having a cyby the arms. The size of these squared oi areas lindrical bore 7, adapted to loosely receive the is so proportioned with respect to the working shank 2, when the parts are assembled in a mansurfaces or areas of the cutter head, extending ner hereinafter described. The grinding head has between the grooves 11, as to insure a smooth close a flat top surface 8 and a conical working surface t between the parts.

9 of suitable pitch or slope and having a substan- It will be understood from the foregoing that tially narrow at bottom surface 10.r Relatively the washer12 engages the annulus of the clampdeep substantially V shaped grooves 11, prefering member 16 and the clamp nut 13 threadedly ably ve in number, are cut radially into the engages threads 4 and tightly clamps the grind-Y grinding head on a slightly decreased pitch from ing head and abrasive disk 14 together. The end 50 that of the cone working surface 9, the grooves of the shank Zis squared as at 20, to facilitate extending from the top surface 8 to the flat botuse of a wrench in grinding the valve seat, or aV tom surface 10. A washer 12 is adapted to slip rod may be inserted in a circular hole 21, located over the threaded end 4, and a centrally bored below the squared end, and by means of which the clamp nut 13, when screwed home on the threads tool may be rotated. u

To assemble my device I slip the grinding head With the abrasive disk 14 and clamping member 16 iitted thereon onto the reduced portion 3 of the shank, and slide the Washer 12 thereon and then screwrhome the clamp nut 13 on threads 4 of the shank, v.thus tightly clamping the abrasive element and the grinding head together. The pilot stem 5 may be screwed into the end of shank 2 either before or after the Washer 12 and nut 13 have .been applied. After inserting the head into the valve seat, the tool is rotated by means of either a Wrench or rod, as previously described.

. To replace a Worn or damagedabrasive disk1`4, it is merely necessary to remove the clamp nut andA washer, slip the clamping member 16 off the sha-nk, and remove the disk. A- fresh disk can then be easily and expeditiously mounted upon the grinding head. f

Having thus described my invention, what I claim is:

`1. A tool Vfor grinding valve seats comprising a shank, having a conical grinding head thereon, adapted to engage the valvev seat, said head having Vr shaped recesses formed therein, an abrasive member adapted to partly cover said head and fit in said recesses, a clamping element forl clamp'- ing said disk against said grinding head having V-shaped arms adapted to iit into the grooves formed Vin the head'for holding the disk against said head. 2. A tool for grinding valve seats comprising a shank with a reduced portion thereon, having a conical grinding head thereon, said head having radial V shaped' recesses formed therein, an'abraL sive member adap-ted to i'lt over said head, a sub-Y stantially rigid clamping element having V shaped arms for clamping said abrasive member'in said recesses and against said head.

3.1 A tool for grinding valve seats comprising a shank having a reduced portion, a conical grinding head mounted on said reduced portion.. said head having i-lve Vshaped radial tapered grooves therein, a flexible abrasive member substantially covering said head, a substantially rigid clamping element having V shaped tapered arms `for said clamping member in clamping said abrasive member against said head, and means on said shank for holding said clamping member in position against said head. v

4. A tool for grinding valve seats comprising a shank having a reduced threaded portion,A a conical grinding head mounted on said reduced portion, said head having ve V shaped radial tapered grooves formed therein, a flexible abrav sive member substantially covering said head,"a semi-rigid metal 'clampingfelement' having V shaped tapered arms for clamping saidabrasive member against said head, threaded means threaded on said reduced portion Vfor retaining head.

position against saidv 5. A tool forgrinding valve seats comprisinga shank, Aa conical grinding head mountedthereon, relatively deep, radial V shaped grooves formed therein, an abrasive disk removably mounted on said head, a metal clamping member having V shaped tapered arms adapted to t inthe grooves formed in the shell for holding the abrasive disk. against said-head, saidgclamping member having means thereon for allowing the abrasivematerial to stretch when clamped, a clamp'nut and Washer mounted on said shankfor retaining theclaxnping member and abrasive disk in position against said head.; Y

' 6. -A tool for grinding valve seats comprising f a sha-nk, a conical grinding head-mounted thereon having V shaped grooves formed 'therein,`an abrasive disk substantiallycovering said head, a semi-rigid metal clamping member having V shaped tapered arms adapted to fit in said grooves for clamping the abrasive disk against the sides of said grooves, concaved surfaces on said clamping element to permit said abrasive diskto stretch.

7. A tool of the character described having a grooved grinding head, an abrasivev` element substantially covering said head, a semi-rigid metal clamping member having V shaped taperedfarms, the upper endsthereof andthe bottom of said element being concave to permit stretching of said abrasive element.

' LAWRENCE O. BEARD; r 

